Recalled to Life (janiel)

Hyungseok hasn't yet lived two decades and he's already become one of the most skilled members of the police force around. Now, he's on a mission. A mission to destroy an association of some sort, one that people call 'the four crews'. This in itself isn't what intimidates him. It's the fact that this time, he's committing to something meant to last longer than just a few months. This time, he has to enroll in Jaewon High School, the center of all happenings that pertain to this "gang", or whatever you may want to call it.

Let's just say, this a battle to end the war. Love, grief, and a multitude of misunderstandings take place as Hyungseok forces his way into a semi-normal high school life.

Inspired by a fanfic on AO3 called "Agent Ghost", written by user Angel_Lie